40.84% is the change from 666 to 938
Calculation steps:
[( 938 - 666 ) ÷ 666] x 100 = 40.84%
Formula
Percentage change = [(938 - 666) / 666] x 100
Subtract the new number by the original number
938 - 666 = 272
272 ÷ 666 = 0.4084084084084084
0.4084084084084084 x 100 = 40.84%